Spiral staircases are usually installed in areas where it is difficult to access an upper floor without too much cost and upheaval. Often times these staircases are in various forms of metal which can infringe ones modesty if wearing a short skirt whilst ascending or descending! Plus so many metal spiral staircases I have experienced are badly constructed and feel unstable whilst in use.
This enclosed version looks modern, sturdy and yet makes a design statement on any room - regardless of how short your skirt is!
What do you think?